Trussed girder



1.1.1" ijle Vmi Patented Aug. 3, 1926.l

UNITED sTA' I E s ,.Ql'fi 1,594,505 PATENT'OFFICEQ? LEWIS A. FRYE, OFLOS ANGELES, CLIFRNIA.

This invention relates to a trussed girder and more particularly to acontinuous trussed girder; and an object of the invention 1s to providea continuous trussed girder structure which is particularly strong andrigid for its size and Weight yet simple and inexpensive. y

The invention is particularly applicable to structures-for suspended orelevated railway Systems altl'iough it will be understood that it is notin any way restricted to such specific application. In the `presentdisclosure of the invention it is applied to a structure for carrying arail adapted to carry suspended monorail cars.

A particular feature of the invention 1s the manner in which thesections, or girders, are connected and trussed so that they areexceptionally strong and rigid. The strength and rigidity obtained bythe present invention are particularly advantageous for structures ofthe character above specified.

Other objects and features of the inven`- tion will be best understoodfrom the follow ing detailed description of a preferred ernbodiment ofthe invention throughout which reference is had to the accompanyingdrawings, in Which- M H i Y.

` Fig. 1 is a side elevation of a trussed girder as provided by thepresent invention; Fig. 2 is an enlarged `side elevation of a portion ofthe girder showing the manner inywhich the truss rods are spaced fromthe girder; Fig. 3 is an enlarged detailedsectional view taken as`indicated by line 3--3 on Fig. 1; Fig.A 4 is a detailed sectional viewtaken as indicated by line 4-4 on Fig. 3; and Fig.L 5 is a sideelevation of the parts shown in Figs. 3 and 4 being a View taken asindicated by line 5- -5 on Fig. 4. i

Throughout the drawings numerals 10 designate I beams arranged end toend and tied, or connected, together vby channels 11 and angles orchannels 12. The I beams 10 may be, and preferably are, standard I beamsand have a plate 13 riveted or otherwise suitably secured to their upperflanges 14. The plate 13 forms a member or base on whichv tomount thecup, or U-shaped, rail 15 and also strengthens the structure laterallyAwhen it is madepcomparatively wide as shown in the drawings.

raussnn Gianna.

Application led May 18, 1920,`Seria1 No. 382,448. Renewed n.`I1`1ne' 11,1923..v

relative, to uiefingaaidinai axis of the I beams 10, and are arranged sothat their webs 16 engageorseat against the webs 17 of the I beams,andso that they are between the flanges 14 and 18 l of the I'beams. "Themanner in which the `channels 11 are arranged in connection `with theIbeams 10ji`s clearly illustrated in Figs. 4 and `5 of the drawings. Itlwill be noted in these figures of the drawings that thechannel 11 lissecured to each of the' abutting beams 10 by rivets 2O `therebypositively and securely connecting them. It will be understood, ofcourse, that any suitablevnumber of rivets 2O may be employed to connectthe I beams'and channels 11 in orderto make the connection 17 of beams10,- andare spaced somewhat apart so that the web 22 of supporting beam23 will fit between their adj acentfianges 24, as shown in Fig. 4. LTheparticularsupport'- ing beams23 herein shown, are comparatively large,or heavy, horizontally disposedI beams, but it will be understood thatthe invention is lnot in any way limited to any one specific form ofsupporting members. The flanges 24 and web 22'areconnectedftogether bysuitable rivets 25 therebymaking the two channels 12 practically aAsolid orI continuous member. Thew'ebs 21`of the channel members 12 aresecured to the webs 17 of I beams 10 by rivets'20, as clearly, shown inFigs. 3 and 4, thereby causing the` two channel members 12, or the-structur'eformed by the two channel members 12, to co-opera`te with thechannel 11 in tying or connecting theI beams 10 together. `The I beams10, being thus tied or lsecured together by the channels 11 and channels12, form a continuous structure having' apoint of support at eachbeamconnection. i yk"` y To reinforce, 0r truss, ther structure formedby the Ibeams 1() to make it strong and rigid, truss rods 27 arearranged between thefianges 28 of adjacent channels 11 and between`adjacent fianges29 of channels 12. This arrangement of truss rods 27causes each I beam 10 to be trussed by two rods. The truss rods 27 Yinconnection with each I beam 10 each extend over two spacers or struts 30which extend downwardly from the flange 18 of the beam as clearly shownin Figs. 1, 2 and 3. The struts 30 are each arranged 'from the ends ofthe beam at a distance equal toapproximately one third of thetotallength of the beam. Each strut 30y comprises a wooden block 31,secured to the flange 18y by suitable angle irons 433, as clearly shownin the drawings, and a plate or saddle V34 mounted onthe outer end ofthe block 31. The saddle 34 has hooks 35 formed at opposite'sides to`carrythe truss rods`27, las clearly shown in Figs. 2 and 3.

The ends of the truss rods 27 extend through the flanges 28 and theflanges 29 and carry nuts 36. Suitable wedge shaped washers 37 arearranged under. thef nuts 36, which are on the rods that extend throughflanges 28', so that the nuts willhave a flatk suitably disposed surfaceon which to seat. yThe :washers 37k are shaped to compensate for theangularity at whichA the rods 27 extend through the flanges 28, causedby the arrangement of the rods over the spacers 30, and valso theangularity ofthe inner faces 38 of flanges 28. Suitable wedge shapedwashers 39 are arranged under the nuts 36, 4on the rods whichextendthrough flanges 29 so that the nuts will have a flat suitablydisposed surface on which to seat. In the constructions shown inthedrawings the channels 12 are formed of even thickness throughout so thatthe washers 37 need only compensate for the angularity at which the rods27 extend through the flanges 29. y

A turn buckle 40 is arrangedfin each truss rod- 27, intermediate of itstwo ends so that it can be tightened or put under tension. When thetruss rods 27 are put lunder tension they tend to draw the channels'lltogether and to `draw the channels 12 t6- gether thereby causing the Ibeams 10 to Abe put under compression, or in other words, causing thebeams 10 to become compression members. When a load comes upon an Ibeam- 10 at any point, or points, between its two ends, the beam tendsto flex or'bend downwardly and thereby causes increased tension to comeupon rods 27 which thereupon cause increased compression .to come uponthe I beam 10 greatly increasing its ability to resist the forces actingupon it. In practice, when the truss rods 27 are under the properytension, a load, or pressure,`upon the beam 10 will cause practically nofiexure or bending of it. f

The truss rods 27 of adjacent I beams 10 are vsecured or tied togetherVby the channels 11 andthe channels or angles `12thereby causing thetruss rods tobe practically continuous, and causing stra-in to betransferred between adjacent truss rods through the channels 11 or thechannels 12. Further, part of the strains in the truss rods, supportingany one particular I beam, are also "transmitted to the adjacent beamsthrough the channelsy 11 and channels 12 Adue to the channels beingsecured to the The strains or forces in any one beams. I beam10 vand itstruss rods 27, are partially transmitted or ydistributed to adjacent Ibeams and truss rods thereby preventing concentration of strains on anyone member or section yof lthe structure. In other words, theconstruction is continuous and suchl that aiload on any one particular Ibeam sets up forces in vthat I beam which are distributed through theentire structure and particularly into the adjacent 'I' beam and theirtruss rods. n A j It will be noted in the drawings that the saddles 34and blocks 35, which carry the truss rods, are spaced considerabledistance apart, infact, sothat they'are outward of lthe outer edges ofthe flanges 18. Further, the flanges 28 and 29 are comparatively shortand do not 'extend outwardly beyond the flanges 14 and 18. The flangesl28 and 29 being short cause the ends of the truss rods to be securedclose vto theweb 17 of beams 10, while the hooks 35 being spaced bothdownwardly yand'outwardly from the beamy cause the middle portions ofthetruss rods to` be both below and outwardly from the beams. As hasbeenjbefore stated the truss rods bybeing arrangedbelow the beamsstrengthens them against downward flexure or bending; lin a likevmannerthe arrangement of the truss rods outwardly from the beams greatlystrengthens them against lateral flexure or bending. With thearrangement of truss rods just described the ends of the truss rods arenot only arranged close tothe webs117 but arealso arranged close to,orimmediately below the-flanges 14. The arrangement of the vends of therods close to the flanges 14 causes the forces, from the truss rodsytending to compress the beams to be applied directly to the upperportions of the vbeams where they are most effective. l f i I-Iaving setforth a preferred embodiment of my invention-I do not wish to limitmyself to the specific details hereinabove set forth but wish to reserveto myself any changes or variations y,that may appear'to those skilledin the art or that may fall within the scope of the following'claim.

Having described av preferredl form of my invention, I claim Incombination, a plurality bers tothe support membersand also connectingthe opposed ends of adjacent beam members at top and bottom in a mannerof beam members 4meeting end to end, lsupport members to form acontinuous beam, vertical flanges cured to the flanges of the connectingmemon the connecting members and which extend bers at points above theneutral axis of the laterally from the side faces thereof, and beam. 10a truss member associated with each beam In Witness that I claim theforegoing I 6 membera each truss memlmn extending below have hereuntosubscribed my name this 4th its associated beam member between thesupday of May 1920. porting members and being terminally se- LEWIS A.FRYE.

